Tails works on most reasonably recent computers, say manufactured after
2008. Here is a detailed list of requirements:

Either an internal or external DVD reader or the possibility to boot
from a USB stick.

Tails requires a 64-bit x86-64 compatible processor: IBM PC compatible and others
but not PowerPC nor ARM. Mac
computers are IBM PC compatible since 2006. Tails does not run on most
tablets and phones.